Hi, Here are a few brief comments. I would say the phrase is best used to emphasize something important to the reader. Broadly speaking, it should be used iin a context where the writer is instructiong / ordering / advising the reader in some way.
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dalepresWhat is the point of adding the phrase to the beginning of a sentence?To emphasize that the information in that sentence is more important than that in other sentences in the same text, perhaps. Similar beginnings are found everywhere: